CN112572091A

CN112572091A - Thermal management system

Info

Publication number: CN112572091A
Application number: CN201910930161.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2019-09-29
Filing date: 2019-09-29
Publication date: 2021-03-30
Anticipated expiration: 2039-09-29
Also published as: CN112572091B

Abstract

The invention discloses a heat management system which comprises a compressor, a first heat exchanger, a volume part and a first throttling unit, wherein a first opening of the volume part is positioned between a second opening of the volume part and a third opening of the volume part along the gravity direction, the second opening of the volume part is positioned below the third opening of the volume part, the first opening of the volume part can be communicated with the first throttling unit, the second opening of the volume part is communicated with a second port of the first heat exchanger, the third opening of the volume part can be communicated with an inlet of the compressor, and when the heat management system works, the volume part can provide a storage space for redundant refrigerant.

Description

Thermal management system

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of thermal management systems.

[ background of the invention ]

Because the thermal management system inevitably has a trace amount of leakage, a certain amount of redundant refrigerant is required in the system during charging to prevent the lost refrigerant from affecting the performance of the thermal management system due to leakage; in addition, during refrigerant charging, excess refrigerant is also typically charged to prevent the performance of the system from being affected by insufficient refrigerant. Thus, there is some redundancy of refrigerant within the thermal management system, which requires some space to store the redundant refrigerant.

[ summary of the invention ]

The present invention aims to provide a thermal management system that facilitates the solution of the above technical problem.

A thermal management system comprises a compressor, a first heat exchanger, a volume part and a first throttling unit, wherein the volume part comprises a volume cavity and three openings communicated with the volume cavity, in the gravity direction, a first opening of the volume part is positioned between a second opening of the volume part and a third opening of the volume part, the second opening of the volume part is positioned below the third opening of the volume part, the first opening of the volume part can be communicated with the first throttling unit, the second opening of the volume part is communicated with a second port of the first heat exchanger, and the third opening of the volume part can be communicated with an inlet of the compressor;

in a heating mode of the thermal management system, the first port of the first heat exchanger is communicated with an inlet of the compressor, the first throttling element is opened, the first opening of the volume part is a flow inlet of refrigerant, and the third opening of the volume part is communicated with the inlet of the compressor; in a cooling mode of the heat management system, an outlet of the compressor is communicated with a first port of the first heat exchanger, a first opening of the volume part is a refrigerant outflow port, and a third opening of the volume part is closed.

A thermal management system comprises a compressor, a first heat exchanger, a volume part, a flow regulating unit and a first throttling unit, wherein the volume part comprises a volume cavity and three openings communicated with the volume cavity, in the gravity direction, a first opening of the volume part is positioned between a second opening of the volume part and a third opening of the volume part, the second opening of the volume part is positioned below the third opening of the volume part, the first opening of the volume part can be communicated with the first throttling unit, the second opening of the volume part is communicated with a second port of the first heat exchanger, and the third opening of the volume part can be communicated with an inlet of the compressor through the flow regulating unit; the thermal management system further comprises a liquid level sensor and a controller, wherein the controller can obtain the liquid refrigerant level in the volume part according to the liquid level sensor;

in a heating mode of the heat management system, the controller obtains the current liquid level of the liquid refrigerant, judges the relationship between the current liquid level of the liquid refrigerant and a set value, increases the opening of the flow regulating unit if the current liquid level of the liquid refrigerant is less than the set value, and decreases the opening of the flow regulating unit if the current liquid level of the liquid refrigerant is greater than the set value.

The heat management system comprises a volume part, wherein the volume part is provided with three openings, a first opening of the volume part is positioned between a second opening of the volume part and a third opening of the volume part along the gravity direction, a second opening of the volume part is positioned below the first opening of the volume part, when the heat management system heats, the volume part has a gas-liquid separation function, a gas refrigerant enters an inlet of the compressor from the third opening of the volume part, a liquid refrigerant enters the first heat exchanger to release heat, the uneven gas-liquid two-phase distribution of the refrigerant in the first heat exchanger can be relatively reduced, and a space between the first opening of the volume part and the third opening of the volume part can be used as a storage space of redundant refrigerant; when the heat management system cools, the third opening of the volume part is closed, the liquid refrigerant flows out from the first opening, and the space between the first opening of the volume part and the third opening of the volume part is a storage space of the redundant refrigerant.

[ description of the drawings ]

FIG. 1 is a schematic connection diagram of a first embodiment of a thermal management system;

FIG. 2 is a schematic connection diagram of a second embodiment of a thermal management system;

FIG. 3 is a schematic connection diagram of a third embodiment of a thermal management system;

FIG. 4 is a schematic connection diagram of a fourth embodiment of a thermal management system.

[ detailed description ] embodiments

The thermal management system in the technical scheme of the invention can be applied to various modes, some of which can be applied to a vehicle thermal management system and can also be applied to other thermal management systems such as a household thermal management system or a commercial thermal management system, and a specific vehicle thermal management system is taken as an example and is described with reference to the attached drawings.

Referring to fig. 1, the thermal management system includes a first heat exchanger 103, a second heat exchanger 104, a third heat exchanger 105, a throttling element and a compressor 10, in this embodiment, the throttling element includes a first throttling element 202 and a second throttling element 203, a refrigerant inlet of the second heat exchanger 104 is communicated with an outlet of the compressor 10, and high-temperature and high-pressure refrigeration releases heat in the second heat exchanger 104, thereby regulating the temperature of a fluid flowing through the second heat exchanger 104. The second throttling element 203 is disposed at the refrigerant inlet of the third heat exchanger 105, and is used for reducing the pressure of the refrigerant entering the third heat exchanger 105, the refrigerant outlet of the third heat exchanger 105 can be communicated with the inlet of the compressor 10, the refrigerant after being throttled and decompressed absorbs heat of the fluid flowing through the third heat exchanger 105 in the third heat exchanger 105, and the heat absorbed by the refrigerant in the third heat exchanger 105 comes from the fluid flowing through the third heat exchanger 105. The first heat exchanger 103 is capable of exchanging heat with ambient air and the refrigerant within the first heat exchanger 103 is capable of absorbing heat from the fluid flowing through the first heat exchanger 103 or releasing heat to the fluid flowing through the first heat exchanger 103. In the present embodiment, the first heat exchanger 103 is disposed outside the air conditioning box of the vehicle, the second heat exchanger 104 and the third heat exchanger 105 are located in the air duct inside the air conditioning box of the vehicle, and the second heat exchanger 104 and the third heat exchanger 105 exchange heat with the air flow inside the air conditioning box to adjust the temperature of the air flow inside the air conditioning box, and thus adjust the temperature inside the vehicle. In other embodiments, the second heat exchanger 104 and/or the third heat exchanger 105 may also be a two-pass heat exchanger, for example, the second heat exchanger 104 and/or the third heat exchanger 105 may be a plate heat exchanger, in which case the thermal management system includes a refrigerant system and a coolant system (not shown), the two-pass heat exchanger includes a refrigerant flow path and a coolant flow path, and the refrigerant of the refrigerant system and the coolant of the coolant system can exchange heat in the two-pass heat exchanger, wherein the refrigerant flow path is a part of the refrigerant system and the coolant flow path is a part of the coolant system. Specifically, the coolant system comprises a first coolant system and/or a second coolant system, wherein the first coolant system comprises a coolant flow channel of the second heat exchanger 104, a first pump (not shown) and a fourth heat exchanger (not shown), the first pump is used for driving the coolant in the first coolant system to flow, and the fourth heat exchanger is arranged in an air duct of the vehicle air-conditioning box; the second coolant system includes a coolant flow passage of the third heat exchanger 105, a second pump (not shown) and a fifth heat exchanger (not shown), the fifth heat exchanger is disposed in an air duct of the vehicle air conditioning box, and the second pump is used for driving the coolant in the second coolant system to flow.

The thermal management system further comprises a volume portion 500, a valve portion, a first valve device 205 and a first one-way valve 206, the first valve device 205 comprises a first communication port, a second communication port, a third communication port and a fourth communication port, the first valve device 205 has two working states, namely a first working state and a second working state, when in working, in the first working state of the first valve device 205, the first communication port is communicated with the second communication port, and the third communication port is not communicated with the fourth communication port; in the second operating state of the first valve device 205, the first communication port communicates with the third communication port, and the second communication port communicates with the fourth communication port. In the present embodiment, the first communication port communicates with the refrigerant outlet of the second heat exchanger 104, the second communication port communicates with the first port of the first heat exchanger 103, and the fourth communication port communicates with the inlet of the compressor 10. In the present embodiment, the valve portion is a valve unit 520, specifically, the valve unit 520 is a check valve, and in other embodiments, the valve unit 520 may be an on-off valve or a flow rate control valve having a shut-off function.

The volume part 500 comprises a volume cavity and three openings, namely a first opening 501, a second opening 502 and a third opening 503, which are communicated with the volume cavity, wherein, along the gravity direction, the first opening 501 of the volume part is positioned between the third opening 503 of the volume part and the second opening 502 of the volume part, and the second opening 502 of the volume part is positioned below the third opening 503 of the volume part. In the present embodiment, the second opening 502 of the volume portion is located at or near the lowermost end of the volume portion 500, and the third opening 503 of the volume portion is located at or near the uppermost end of the volume portion 500. The first opening 501 of the volume portion communicates with the first port of the first throttling element 202, the second port of the first throttling element 202 can communicate with the third communication port, the first opening 501 of the volume portion communicates with the inlet of the first check valve 206, the first port of the second throttling element 203 communicates with the refrigerant inlet of the third heat exchanger 105, the second port of the second throttling element 203 communicates with the third communication port, and the outlet of the first check valve 206 can communicate with the inlet of the third heat exchanger 105 through the second throttling element 203; the second opening 502 of the volume portion and the second port of the first heat exchanger 103 are communicated with each other, and the third opening 503 of the volume portion can be communicated with the second communication port of the first valve device through the valve unit 520, wherein when the valve unit 520 is a check valve, the second communication port of the first valve device 205 is directed toward the third opening 503 of the volume portion, the valve unit 520 is closed, and conversely, the valve unit 520 is opened. In other embodiments, the third opening 503 of the volume part may directly communicate with the inlet of the compressor 10. In addition, the first throttling element 202 may be a throttling device having a shutoff function, so that the first check valve 206 can be eliminated, and if the first throttling element 202 has a one-way shutoff function, the first throttling element 202 is in a conducting state when the fluid flows from the first opening 501 of the volume portion to the third heat exchanger 105, and the second throttling element 202 is in a throttling state from the third communication port of the first valve device 205 to the volume portion 500. In other embodiments, the first one-way valve 206 may also be a switch valve and will not be described in detail. In addition, the connection or communication described in this specification may be direct connection or communication, for example, two components may be assembled together, so that a connection pipeline may not be required, and the system is more compact, or may be indirect connection or communication, for example, communication through a pipeline, or communication after passing through a certain component, which is not illustrated herein; according to the technical scheme, the opening degree of the opening throttling unit finger throttling unit is the largest, the opening degree of the closing throttling unit finger throttling unit is zero, and the opening throttling unit finger is opened and closed or the throttling state of the throttling unit is opened.

In the present embodiment, the second throttling element 203 may be a thermostatic expansion valve having a cut-off function, and the thermostatic expansion valve adjusts its own opening degree according to the degree of superheat at the outlet of the third heat exchanger 105. In other embodiments, the second throttling element 203 may also be an electronic expansion valve, the opening degree of the electronic expansion valve is adjusted according to the superheat degree of the outlet of the third heat exchanger 105, and since the second throttling element 203 adjusts its own opening degree according to the superheat degree, the refrigerant discharged from the refrigerant outlet of the third heat exchanger 105 is in a gaseous state, and in this case, the gas-liquid separator 207 may not be needed in the thermal management system, and of course, the thermal management system may also be provided with the gas-liquid separator 207 to prevent liquid refrigerant from entering the compressor due to other reasons. If the first throttling element 202 is also a thermal expansion valve or an electronic expansion valve (when the first throttling element 202 is an electronic expansion valve, the degree of superheat at the outlet of the first heat exchanger is used for adjusting the opening degree of the first throttling element), the heat management system does not need to be provided with the gas-liquid separator 207. In a thermal management system, because the system inevitably has a trace amount of leakage, a certain amount of redundant refrigerant is needed to prevent the lost refrigerant caused by the leakage from influencing the performance of the system; additionally, during refrigerant charging, it is also typically necessary to charge an excess amount of refrigerant to prevent affecting system performance. Therefore, the refrigerant in the thermal management system has a certain redundancy, and a certain space is also required in the thermal management system to store the redundant refrigerant, and in the present embodiment, the volume part 500 provides a space for the redundant refrigerant.

An inner circulation air port, an outer circulation air port and a circulation air door for adjusting the sizes of the inner circulation air port and the outer circulation air port are arranged on one air inlet side of the air conditioning box, the inner circulation air port is communicated with the interior of the vehicle, and air in the vehicle enters an air channel of the air conditioning box through the inner circulation air port and then enters the interior of the vehicle again to form inner circulation; the external circulation air port is communicated with the outside of the vehicle room, and air outside the vehicle room enters the air channel of the air conditioning box through the external circulation air port and then enters the vehicle room to form external circulation. In addition, a fan 303 is further disposed on one side of the first heat exchanger 103, so that the speed of the wind flowing through the first heat exchanger 103 can be increased. A blower 304 is provided at a position of the air-conditioning case body near the inner circulation air opening and the outer circulation air opening to adjust the air flow velocity in the air-conditioning case.

The heat management system comprises a heating mode and a cooling mode. When the ambient temperature is high, the thermal management system enters a cooling mode. In the cooling mode of the thermal management system, the first valve device 205 is in the first working state, that is, the first communication port is communicated with the second communication port, the third communication port is not communicated with the fourth communication port, the high-temperature and high-pressure refrigerant enters the first port of the first heat exchanger 103 through the second heat exchanger 104, at this time, the refrigerant does not exchange heat or exchanges heat slightly with the fluid flowing through the second heat exchanger 104 in the second heat exchanger 104, the high-temperature and high-pressure refrigerant releases heat in the first heat exchanger 103, the liquid or gas-liquid mixed refrigerant enters the second opening 502 of the volume portion, when the liquid refrigerant is higher than the first opening 501 of the volume portion, the liquid refrigerant enters the second throttling element 203 through the first check valve 206, and is throttled and depressurized through the second throttling element 203, the refrigerant absorbs heat in the third heat exchanger 105 and becomes a gaseous refrigerant, and enters the inlet of the compressor 10. In the cooling mode, the gaseous refrigerant is separated from the liquid refrigerant, the liquid refrigerant flows out from the second opening 502 of the volume part, the third opening 503 of the volume part is closed due to the closing of the valve unit 520, the gaseous refrigerant is stored between the first opening 501 of the volume part and the third opening 503 of the volume part, and the volume part 500 has a function of buffering the refrigerant, or the volume part 500 is a storage space of redundant refrigerant in the thermal management system.

When the ambient temperature is low, the heat management system enters a heating mode, and in the heating mode of the heat management system, the first valve device is in a second working state, namely the first communication port is communicated with the third communication port, and the second communication port is communicated with the fourth communication port. The high-temperature and high-pressure refrigerant discharged by the compressor 10 releases heat in the second heat exchanger 104, the refrigerant enters the first throttling element 202 through the first valve device, the refrigerant is throttled by the first throttling element 202 and then becomes a gas-liquid two-phase state, the refrigerant enters the first opening 501 of the volume part, the gaseous refrigerant rises and the liquid refrigerant descends under the action of gravity, the liquid refrigerant enters the second port of the first heat exchanger 103 from the second opening 502 of the volume part, the liquid refrigerant absorbs heat in the first heat exchanger 103, the gaseous refrigerant enters the compressor 10 through the first valve device 205 to participate in the next cycle, and the gaseous refrigerant does not enter the compressor through the first heat exchanger 103, so that the liquid refrigerant can pump more heat from the first heat exchanger 103, and further, the second heat exchanger 104 is favorable for releasing more heat. In addition, the liquid refrigerant after gas-liquid separation enters the first heat exchanger 103, and the gas heat exchanger enters the compressor 10, so that the problem of uneven gas-liquid two-phase distribution of the refrigerant in the first heat exchanger 103 can be relatively reduced, the heat absorption capacity of the first heat exchanger 103 can be improved, and the heating capacity of the second heat exchanger 104 can be improved. If the opening degree adjustment of the first throttling element of the thermal management system depends on the superheat degree of the first port of the first heat exchanger 103, the thermal management system does not need to be provided with the gas-liquid separator 207, and the device for storing redundant refrigerant is the volume part 500; in contrast, the thermal management system needs to be provided with a gas-liquid separator 207, and the gas-liquid separator 207 has a function of storing the refrigerant.

Referring to fig. 2, the valve portion further includes a flow rate adjusting unit 510, a first port of the flow rate adjusting unit 510 communicates with the third opening 503 of the volume portion, a second port of the flow rate adjusting unit 510 communicates with an inlet of the valve unit 520, and an inlet of the valve unit 520 communicates with a second communication port. The flow rate adjusting unit 510 can adjust the flow rate of the gas flowing out from the third opening 503 of the volume portion. Specifically, the thermal management system comprises a liquid level sensor 700 and a controller 600, the controller 600 can adjust the opening of the flow regulating unit according to the relationship between a liquid level set value and a current liquid level value, and specifically, the controller 600 can obtain the liquid refrigerant level in the volume part 500 according to the liquid level sensor 700; in the heating mode of the thermal management system, the controller 600 obtains the current liquid level of the liquid refrigerant and a set value, determines the relationship between the current liquid level of the liquid refrigerant and the set value, increases the opening of the flow regulating unit if the current liquid level of the liquid refrigerant is less than the set value, decreases the opening of the flow regulating unit if the current liquid level of the liquid refrigerant is greater than the set value, and further regulates the flow of gas discharged from the third opening of the volume part 500 to keep the liquid level of the liquid refrigerant stable, thereby stabilizing the operation of the thermal management system.

Of course, in other embodiments, the first port of the flow rate adjustment unit 510 communicates with the outlet of the valve unit 520, the inlet of the valve unit 520 communicates with the third opening 503 of the volume portion, and the second port of the flow rate adjustment unit 510 communicates with the second communication port. The valve unit 510 may also be an on-off valve, or the flow rate adjustment unit 520 may have a shut-off function. Further, the flow regulating unit 520 and the valve unit 510 may be integrally or separately provided, and the flow regulating unit 520 and/or the valve unit 510 may be integrally provided with the volume portion 500, which may allow the thermal management system to be relatively simplified.

Referring to fig. 3, in comparison with the embodiment illustrated in fig. 2, the compressor 10 includes a first inlet 101 and a second inlet 102, wherein the pressure of the refrigerant entering the first inlet 101 is lower than the pressure of the refrigerant entering the second inlet 102, the fourth communication port of the first valve device 205 communicates with the first inlet 101 of the compressor 10, and the third opening 503 of the volume portion can communicate with the second inlet 102 of the compressor 10 through the valve portion. The thermal management system further comprises a first branch 1001 and a first pipeline 1002, the first branch 1001 and the first pipeline 1002 are arranged in parallel, the first branch 1001 comprises a third throttling element 204, two ports of the first branch 1001 are respectively communicated with a first port of the first heat exchanger 103 and a second opening 502 of the volume portion, a second port of the first heat exchanger 103 can be communicated with the second opening 502 of the volume portion through the first branch, two openings of the first pipeline 1002 are respectively communicated with the first port of the first heat exchanger 103 and the second opening 502 of the volume portion, and a second port of the first heat exchanger 103 can be communicated with the second opening of the volume portion through the first pipeline 1002. Specifically, when the thermal management system heats, the third throttling element 204 is opened, and the first throttling element 202 is opened, it can be known that the pressure in the volume cavity is greater than the pressure in the first heat exchanger 103, and the gas discharged from the third opening 503 of the volume part enters the second inlet 102 of the compressor 10 through the valve part to participate in the next cycle.

Referring to fig. 4, compared to the embodiment illustrated in fig. 2, only the differences from the second embodiment will be described, the thermal management system includes two heat exchangers, that is, a first heat exchanger 103 and a second heat exchanger 104, the thermal management system includes a first throttling unit 202 and a four-way reversing valve 205 ', the four-way reversing valve 205' has two operating states, in the first operating state of the four-way reversing valve 205 ', a first communication port of the four-way reversing valve 205' is communicated with a second communication port of the four-way reversing valve, and a third communication port of the four-way reversing valve 205 'is communicated with a fourth communication port of the four-way reversing valve 205'; in the second operating state of the four-way selector valve 205 ', the first communication port of the four-way selector valve 205 ' is in communication with the third communication port of the four-way selector valve 205 ', and the second communication port of the four-way selector valve 205 ' is in communication with the fourth communication port of the four-way selector valve 205 '. Specifically, the outlet of the compressor 10 is communicated with the first communication port of the four-way reversing valve 205 ', the second communication port of the four-way reversing valve 205' is communicated with the second port of the second heat exchanger 104 and the outlet of the valve unit 520, the third communication port of the four-way reversing valve 205 'is communicated with the first port of the second heat exchanger 104, the fourth communication port of the four-way reversing valve 205' is communicated with the inlet of the compressor 10, and the second port of the second heat exchanger 104 is communicated with the first opening 501 of the volume portion 500 through the first throttling unit 202. In the case of only two heat exchangers, it is equivalent that the first heat exchanger 103 is disposed indoors or the second heat exchanger 104 is disposed indoors. The thermal management system of this embodiment is relatively simple compared to the second embodiment.

It should be noted that: although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that various combinations, modifications and equivalents of the present invention can be made by those skilled in the art, and all technical solutions and modifications thereof without departing from the spirit and scope of the present invention are encompassed by the claims of the present invention.

Claims

1. A thermal management system comprises a compressor, a first heat exchanger, a volume part and a first throttling unit, wherein the volume part comprises a volume cavity and three openings communicated with the volume cavity, in the gravity direction, a first opening of the volume part is positioned between a second opening of the volume part and a third opening of the volume part, the second opening of the volume part is positioned below the third opening of the volume part, the first opening of the volume part can be communicated with the first throttling unit, the second opening of the volume part is communicated with a second port of the first heat exchanger, and the third opening of the volume part can be communicated with an inlet of the compressor;

in a heating mode of the thermal management system, the first port of the first heat exchanger is communicated with an inlet of the compressor, the first throttling element is opened, the first opening of the volume part is a flow inlet of refrigerant, and the third opening of the volume part is communicated with the inlet of the compressor;

in a cooling mode of the heat management system, an outlet of the compressor is communicated with a first port of the first heat exchanger, a first opening of the volume part is a refrigerant outflow port, and a third opening of the volume part is closed.

2. The thermal management system of claim 1, further comprising a valve portion comprising a valve unit, a first port of the valve portion in communication with the third opening of the volume portion, a second port of the valve portion capable of communicating with an inlet of the compressor;

in a heating mode of the thermal management system, the valve unit closes the third opening of the volume; in a cooling mode of the thermal management system, the valve unit opens the third opening of the volume.

3. The thermal management system according to claim 1 or 2, wherein the valve portion further comprises a flow regulating unit which is open in a heating mode of the thermal management system, the flow regulating unit being capable of regulating the gas flow of the third opening of the volume portion.

4. The thermal management system of claim 3, comprising a second heat exchanger and a four-way reversing valve; the four-way reversing valve comprises four communicating ports, a first communicating port of the four-way reversing valve is communicated with an outlet of the compressor, a fourth communicating port of the four-way reversing valve is communicated with an inlet of the compressor, a second communicating port of the four-way reversing valve is communicated with a first port of the second heat exchanger, a third communicating port of the four-way reversing valve is communicated with a first port of the second heat exchanger, and a second port of the second heat exchanger is communicated with a first opening of the volume part through the first throttling unit; the third opening of the volume part is communicated with the inlet of the compressor or the second communication port of the four-way reversing valve through the valve part;

in a first working state of the four-way reversing valve, a first communication port of the four-way reversing valve is communicated with a second communication port of the four-way reversing valve, and a third communication port of the four-way reversing valve is communicated with a fourth communication port of the four-way reversing valve; in a second working state of the four-way reversing valve, the first communication port of the four-way reversing valve is communicated with the third communication port of the four-way reversing valve, and the second communication port of the four-way reversing valve is communicated with the fourth communication port of the four-way reversing valve.

5. The thermal management system of claim 3, comprising a second throttling unit, a first valve arrangement, a second heat exchanger, and a third heat exchanger, the outlet of the compressor being in communication with the refrigerant inlet of the first heat exchanger;

the first valve device includes a first communication port, a second communication port, a third communication port, and a fourth communication port, the first communication port of the first valve device communicates with the refrigerant outlet of the first heat exchanger, the fourth communication port of the first valve device communicates with the compressor suction port, the third communication port of the first valve device is communicable with the first throttling device and the second throttling device, the second communication port of the first valve device communicates with the first port of the second heat exchanger, and the third opening of the volume portion is communicable with the second communication port of the first valve device or with the inlet of the compressor through the valve portion;

the first valve device at least comprises a first working state and a second working state, the first working state of the first valve device is that the first communication port is communicated with the third communication port, the fourth communication port is not communicated with the second communication port, and the second working state of the first valve device is that the first communication port is communicated with the second communication port, and the third communication port is communicated with the fourth communication port.

6. The thermal management system of claim 5, further comprising a first branch and a first conduit, the first branch and the first conduit being disposed in parallel, the first branch comprising a third throttling element, the second port of the first heat exchanger being communicable with the second opening of the volume through the first branch, the second port of the first heat exchanger being communicable with the second opening of the volume through the first conduit;

the compressor includes a first inlet and a second inlet, the fourth communication port of the first valve device communicates with the first inlet of the compressor, and the third opening of the volume portion is communicable with the second inlet of the compressor through the valve portion.

7. A thermal management system comprises a compressor, a first heat exchanger, a volume part, a flow regulating unit and a first throttling unit, wherein the volume part comprises a volume cavity and three openings communicated with the volume cavity, in the gravity direction, a first opening of the volume part is positioned between a second opening of the volume part and a third opening of the volume part, the second opening of the volume part is positioned below the third opening of the volume part, the first opening of the volume part can be communicated with the first throttling unit, the second opening of the volume part is communicated with a second port of the first heat exchanger, and the third opening of the volume part can be communicated with an inlet of the compressor through the flow regulating unit; the thermal management system further comprises a liquid level sensor and a controller, wherein the controller can obtain the liquid refrigerant level in the volume part according to the liquid level sensor;